Carbureter.



W. P. RTHE.

GARBUBETER. APPLIGATION rILBD Imam. 1910.

Patented July 11,1911.

l zvenio `UNITED STATES PATENT OFFICE.

WILLIAM F. ROTHE, 0F EAST ST. LOUIS, ILLINOIS, ASSIGNOR TO WM. F. ROTHE AND COMPANY, OF EAST ST. LOUIS, ILLINOIS, A CORPORATION OF ILLINOIS.

sansUnirrrnt Specification of Letters Patent.

Patented July 11, 1911.

Application led February 21, 1910. Serial No. 544,991.

Il'o all whom 'it may concern:

1l e it known that I, WILLIAM F. Ro'rrm, a citizen of the United States, and a resident of the city of East St. Louis, county of St. Clair7 and State of Illinois, have in'- Yented a new and useful Improvement in Carbureters, of which the following is a specification. 4

This invention relates to carbureters.

It has for its principal objects to secure a positive correlated action of the air inlet. valve and the oil inlet valve, t provide for a variable and proportional. correlation le tween the two valves, to provide for the thorough mixture of the air and vapor, and to attain certain other advantages hereinafter more fully appearing.

The invention Consists in the parts and in the arrangements and combinations of parts hereinafterdeseribed and claimed.

lIn the accompanying drawings which form part of this specification and wherein like symbols refer to like parts wherever they occur, Figure 1 is a vertical section through the casing of the carburetor showingthe air and oil inlet valves, respectively, in closed position and the throttle' valve in opened position; Fig. Q is a top plan view of the carburetor; Fig. 3 is a detail View of the lever which is interposed between the air inlet valve and the oil inlet valve; and Fig. et is a fragmentary section of a modification of the air i'alve.

The carinii-eter comprises a hollow casing orshell 1. easing l isa mixing chamber 2 Whieh is connected by an ul'ituirned passageway 3 to p spiral passageway The passageway 4 is preferably equipped with a triple bladed spiral 5. whereby the air and vapor is caused to travel in a whirlingmotion throu h the same, so that it is thoroughly mixed efore it leaves the outlet opening 6. The outlet opening is eontrollet, by a cbutterfly valve or circular disk valve 7 which is mounted on a rock-shaft S extending' transversely of the outlet passageway.l On the end of the rock-shaft 8 is a 'le\I'er "arm 9 which may be Connected in any suitable manner to a manipulatingr device, not shown.

A discharge nozzle 10 projects into the mixing chamber 2 tl'iro'ug'h an opening in the bottom of the easingr 1. The outer end portion of this nozzle member is screw-threaded In the bottom portion of the or otherwise suitably arranged for connection with an oil supply pipe, not shown. l'xtendinn` in vertical alineinent with the nozzle 10 is an elongated needle-valve member 1l Whose lower end portion is slidably fitted through a guide opening ina horizontal partition 12 within the casing. The upper end portion of the needle-Valve member 11 is slidably fitted in a central bore 13 in a screw-plug 14 which is secured in a samt-threaded ol'iening in the top of the casing,r 1. The upper portion of the bore 13 is screw-threaded to receive a screw-stud or adjustable -l-iin'iting stop 15. This screw-stud or stop member 15 is provided with a transverse handle portion 1G whereby the same may be conveniently mani ulated and adjusted; and a lock nut 17 1s also provided on said screwstud whereby the same may be locked in its adjusted position. On the lower portion of the needle-valve member 11 is -fixed a collar 18 and on the. upper portion of said member 11 is fixed a second co1- lar 19. Sleeved loosely on the needlefvalve member 11 is a collar 20 and also sleeved on said member 11 is a coil spring 21 which is interposed between said loose collar 2O and the opper fixed collar 19. The-loose feollar 20 is provided with oppositely pro jecting trunnions 9. which are fitted inslots 23 in the ends or forks 21 of a rocking llever 25. ThisI roekinglever 25 is pivotally mounted on a rod Qpwhich extends transversely of the casing 1. The rocking level 25 may obviously be 'n'iade of a casting havingr forked or hifurcated end port-ions or the same may be blanked and formed from a single piece of sheet metal substantially as shown. ,y

The air inlet opening 27 is provided in the top of the casing 1 at the end `opposite to the outlet opening (i. In the'inlet lopening is fitted a. screw-threaded sleeve Q8 and the easing is preferably split and provided with a pair of lugs 529 which are perforated to receive a clamping bolt 30 whereby saidsleeve 28 is securely held in position. A circular disk valve 31 cooperates with the inner end of said annular member or sleeve Q8 and it is secured tightly to an elongated stem or rod 3Q. The Lipper end portion of this rod '32 is slidabl'v fttedin an axial bore in the V sleeve 28 may be also adjusted inwardly or' sleeve 2S. The lower end portion of said valve-stein 32 is slidably fitted in an axial bore 35 in a screw-plug 36 which is fitted in a. screwthreaded opening in the bottom of 5 the casing 1. The lower portion of the bore 35 in said plug 36 is screw-threaded to receive a screw-threaded studor limiting stop member 37. This member' 37 is similar to the member in the screw-plug 14 for the needle-valve and it is locked in its adjusted position by Va jam nui'I 3S. The screw-plug 36 is also adapted to be adjusted longitudinallyV and it is locked in position by a jam nut 39.A Sleeved loosely on the stem 32 adjacent to the valve 31 is a collar 40. This collar 40 is provided with oppositely extend ing trunnions 41 which are fitted in slots 42 in the end portions or forks 43 of the rocking lever 25.- Sleevedon lthe valve-stem 32 between said collar 40 and the inner end of the screw-plug 36 or, preferably, an interposed collar 44, is a coil spring 45 whereby the end portions 43 of the lever 25 are held in contact with the valve 31 to resiliently support the saine in raised osition, in nor- -`final co erative relation wit the inner end of the s eeve 28. By moving the screw-plug 36 inwardlyor outwardly, the tension of said spring45 may be varied. Obviously. the colla;` may be fixed to the stem 32, if desired, 'n which case the end of the lever need. not bear against the under side of the valve 31. Normally, the valve 31 does not entirely close the inlet opening 27 but its peripheral` portion which coperates with the inner end of said sleeve 28 is spaced slightl. therefrom. The needle-valve 11 when ully closed or seated onthe nozzle 10 constitutes, in effect, the stop which limits the up ermost normal position of said valve 31. T iat is, the rocking lever 25 being pivotally connected at one end to the collar 40,

the spring will tilt the lever and /raise thefyyalve 31 until the opposite end portion 45 of the lever 25k which is pivotally connected to the loose collar 2O on the needle-valve 11 bears against; the upper side of the fixed collar 18 on said needle-valve, the parts beingrso proportioned that the spaced osition of' the air valve is thus controlle The outwardly, as desired.

The proportional opening of the needlevalve and the air valve is cont-rolled by the T adjustable screw-studs' or stops 15 and 37 "jaind numerous adjustments may be, eifected V, manilnilatino` the same The spring. 21 Vu'tliich is sleeved onthe needle-va ve 11 is "of sufficient strength to lift said needle-valve when the loose collar 20 is raised by the rocking lever 25. This spring 21 is, however, weaker' than the spring 45 which acts upon the air valve 31. Bygthis arrangement thestop member 15 may b/e adjusted so that thp needle-valve 11 has brit a very slight upward movement and the stop 37 may be adjusted so that the air valve 31 has considerable downward movement, as the spring 21 will yield when the needle-valve is arrested by its stop and permit of the continued movement of the rocking lever until the stem is arrested by its stop.

1n the operation of the carbureter, the out let or throttle valve 7 is opened and the suction stroke of the engine draws the air' into the casing 1' through the inlet opening 27. The valve 31 is thereby drawn downward against the tension of the spring 45. The valve being secured to the stem 32 and bearing upon the end of the rocking lever 25, or the collar 41 being secured to the stem, as the case may be, the lever 25 is rocked and the loose collar 20 on the needle-valve stem 11 is raised. The spring 21 raises the needlevalve 11 until it contacts with the stop 15. When the stem of the needle-valve contacts with the stop 15, the spring 21 will yield and permit 'the air valve 31 to continue its down- `tard movement until the stem 32 contacts with the stop 37. After the engine is started, t'h`e valves .may be adjusted to produce the rel;` ired mixture.

The air vale 31 is provided with a central opening 4t which is normally closed by an outward y (mening reliefvalve 47. This relief valve 47 s sleeved loosely on the upper portion ofthe stern,32 and is resiliently held to its seat by a spring 48 which is sleeved on said stem 32 above said relief valve and adapted to bear against the hub portion 33 when the air valve is in its uppermost position. This relief valve 47 is provided as ai blow back valve to release the pressure iii case of back lires.

To insu e thez opening of the air valve, its periphal portion is cnt away annularly to provided an upper portion 49 of reduced diameter ,'hich fits loosely within the sleeve 28 and ai, annular shoulder or flange 50 below sai i reduced portion which underlies the inner d of said sleeve 28. T hc upper face of thi annular shoulder or flange 50 may be fla and at right angles to the peripheral fate of the reduced portion 49 but it is preferably grooved as shown in Figs. 1 and 4; and the inner end of the sleeve 28 is beveled to correspond to the inclined face of the shoulder as shown in Fig. 1 or it is rounde to correspond to the curvature ofthe contavity or groove 51 in the shoulder 50 illustrated in Fig. 4. By Vthis arrangement. the direct downward movement of the inrushingiair isA broken and the air is deflected latrally and upwardly against the inner end of the sleeve 28 and the surrounding portion of the casing whereby the downward-movement of the air valve is made more positive.

Obviously. the device admit-s of considerable modification without departing from from said mixing chamber,

i the oil valve.

my invention. Therefore, I do not wish Cto be limited to the specic construction and arrangement shown.

What I claim is:

1. A `carburoter comprising alhollow casing having a mixing chamber in the bottom thereof, an air inlet passage leading to said mixing chamber, an outlet passage leading a throttle valve arranged to control the outlet of the mixed air and oil, a valve arranged to control the airinletg'an oil nozzle arranged to discharge into said mixing chamber, a valve arranged to control the discharge from said oil nozzle, a resilient working connection between said air valve and said oil valve whereby said valves are simultaneously actuated. an adjustable stop for varying the opening limit of said oil valve, and an adjustable stop for proportionately7 varying the limit of thev Aopening of said air valve with respect to 2. A carburet'er comprising a hollow casing having amixing chain er in the bottom said mixing chamber, an oil nozzle arranged toA discharge into said mixing chamber` a needle-valve arranged to control the discharge from said oil nozzle, an adjustable stop for limiting the stroke of said needlevalve, an inwardly opening valve arranged to control the air inlet, an adjustable stop for limiting the movement of said air valve, a rocking lever operatively connected to said air valve so as to be actuated thereby, safidrocking lever being' resiliently connected to said needle-valve whereby the latter is simultaneously actuated with said air valve.

3. A carburetor comprising a` casing hav ing a mixino' chamber therein, an air inlet passage leading to said mixing chamber, and an outlet passage arranged to conduct mixed air and oil from said mixing chamber, an oil nozzle Aarranged to discharge into said mixing chamber, a needle-valve arranged to control the discharge from said oil nozzle, an adjustable stop arranged to limit the opening movement of said needlevalve, an inwardly opening valve arranged to control the air inlet, an adjustable device arranged to limit the opening movement of said air valve, a Working connection between said needle-valve and said air valve whereby the needle-valve is actuated simultaneously with the actuation of said air valve, said air jvalve havin' a passage therethrough, and` an outwardly o ening relief valve arranged to normally c ose saidA passage.

4. A carbureter comp'rising a casing -having a. mixing chamber therein: tn air inlet passage leading to said mixing chamber, an oil nozzle arranged to discharge into said Y mixing chamber, a valve arranged to control the discharge from said oil nozzle, an inwardly opening valve arranged to control the air inlet, said air valve having a portion of reduced diameter which is adapted to normally t loosely within the air inlet passage and also having an annular shoulder arranged to extend beyond the sides of the inlet passage at the inner end thereof.

5. A carbureter comprising a casing having a mixing chamber therein, an air inlet passage communicating with saidV mixing chamber, an oil nozzle arranged t-o discharge into said mixing chamber, avalve arrangell to control the discharge from said oil nozzle, an inwardlycpening valve arranged to control they air inletxsaid air valve havin a `portion of rediiced diameter which is adapted to normally fit loosely withiny the air inlet passage, andy also having an annular shoulder which extends beyond the peripheral side face of said reduced portion and having its outer face grooved,` and a counterpartportion at' the inner end Vof said air inlet passage which coperates with the grooved portion of ,siiidtaiinular shoulder on the air valve.

6. A carburetor con'iprising a hollow casing having a mixing chainber therein, an air inlet passage which ycommunicates with said mixing chamber, and anV outlet passage which is arranged to conduct mixed air and oil from'said mixing chamber, means for supplying oil to said mixing chamber, and an inwardly opening valve arranged to control the air inlet, said valve being resiliently held in normal position and having a portion of reduced diameter which normally fits loosely within the air inlet passage and also having an annular shoulder which extends beyond the peripheral side face of said reduced portion, the outer face of said annular shoulder being groovcd. annularly, and a counterpart annular portion at the inner end of said air inlet passage in coperative relation to said annular shoulder on said valve.

7. A carbureter comprising a hollow casing having a mixing chamber therein, and means for supplying oil to said mixing chamber, said casing having an air inlet opening which communicates with said inixin chamber, a sleeve secured in said air init opening, and an inwardly opening valvearranged to coperate with the inner end ortion of said sleeve to control the air inlet, said valve havin a portion of reduced diameter adapted to it loosely within said ,sleeve and also having an annular shoulder extending beyond the peripheral side face of said reduced portion and.` `overlapping the inner end of said sleeve. .y

8. A carbureter comprising a hollow casing having a mixing chamber therein, and means for supplying oil to'said mixing chamber, said casing having an air inlet opening which communicatsq'with said mix-r the inner end of sai charge into said mixing chamber,

connected with said nee ing chamber, a sleeve Secured in said air inlet opening, and an inwardly opening valve arranged to cooperate with the inner end portion of said sleeve to control the air inlet,

5 said vvalve having a portion of reduced diameter which is adapted to fit loosely within said sleeve and also having an annular slioiildei' extending beyond the peripheral side face of said reduced ortion and overlappin sleeve, the face of said shoulder which cooperates with the end of the .sleeve being grooved annularly as a counterpart of the end of said sleeve.

9. A carburetor comprising a hollow cas- 15 ing having a mixing cliainber therein, an air its movement in the opposite direction after said needle-valve has reached. the limit of its opening movement, and an inwardly opening valve arranged to control the air. inlet, a spring arranged to yielflingly vice for limiting the opening movement of said air valve, and an operative connection between said air valve and said rocking lever whereby the opening and closing movements oi said air valve and needle-valve are siniultaneous.

10. A carburetor comprising a casing hav- 5 hold said air' valve in normal position, an ad]ustal?le del l l day df February, '1910.

Ying an air inlet openin therein, and an inwardly opening disk va ve arranged to control the air inlet, said valve having a portion of reduced diameter which is adapted to fit looselyv within said air inlet opening and also having an annular flange portion projecting beyond the peripheral face of said reduced portion, the outer face of said annular flange being grooved annularly, and an annular counterpart portion at the inner end of said inlet opening in coperaive relation to said annularly grooved l'lange on said valve.

11. A carbureter comprising a casing having an air inlet opening therein, a sleeve adjustably secured in said air inlet o ening, and an inwardly opening disk va ve 'arranged to cooperate with the inner end portion of said sleeve to control the air inlet, said valve having a portion of reduced diameter which is adapted to loosely fit Within.

said sleeve and also having an annular flange portion which projects beyond the peripheral face of said l,reduced ortion and overlaps tlie inner end of saicfsleeve, the outer face of said annular flange being grooved aimulariy and the inner being a counterpart of said annular groove.

12. A carburetor comprising a hollow casing having an air inlet opening therein, an inwardly opening disk valvearranged to control theair inlet said valve having a portion ot reduced diameter adapted to fit loosely Within the air inlet opening and an annular portion arranged to overlap the inlet opening.

Signed at St. Louis, Missouri, this 16th lVLLI AM F. ROTHE.

Witnesses:

Gr. A. PENNING'LON, JULIA B. MEGOWN.

end'of said sleeve 

